These fixed effects are in addition to the primary time and/or treatment effects, so do not specify any effects confounded with those. The effects can include any mixture of class variables (as specified in the Class Variables above) or continuous covariates.
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If you specify more than one fixed effect that you must separate the effects with spaces. For example, assuming A and B are listed as Class Variables, typing A B in the text field specifies variables A and B as main fixed effects.
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To specify interactions between effect, type an asterisk (*) between the effects. For example, assuming A and B are listed as Class Variables, typing A B A*B specifies variables A and B, and the interaction between A and B as fixed effects, and constructs a two-way ANOVA model.
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A vertical bar (|) can be used to create main effects and interactions. For example, typing A|B is the same as typing A B A*B.
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